I need help please
Thread Starter
Staging Lane
Joined: Oct 2008
Posts: 85
Likes: 0
From: Kyle,tx
I need help please After about 20 min of drivin my camaro will hesitate and go and about 10min later it gets worse I changed my fuel filter did an fuel injection system cleaner, coil was bad bought an msd and it still hesitated, changed my wires to msd and spark plugs to ngk, did a fuel pressure test and it was good so I was wondering if my opti is goin out can u help me please
1) SES ("Service Engine Soon") light ever come on when it does it?
2) Does it matter where you are on the throttle when it happens or does it stumble at all RPM ranges?
3) Sure you don't have any vacuum or exhaust leaks?
4) You can attach a fuel pressure gauge to the fuel rail next to the regulator and tape it to the windshield and see if you have a precipitous drop when it "does it." Don't laugh- common troubleshooting tip for diagnosing drivability with these cars.
The more information provided, the more helpful suggestions you'll get. There are a number of very knowlegeable techs on this forum that are glad to help. I'm still learning, myself. Welcome to the forum.
2) Does it matter where you are on the throttle when it happens or does it stumble at all RPM ranges?
3) Sure you don't have any vacuum or exhaust leaks?
4) You can attach a fuel pressure gauge to the fuel rail next to the regulator and tape it to the windshield and see if you have a precipitous drop when it "does it." Don't laugh- common troubleshooting tip for diagnosing drivability with these cars.
The more information provided, the more helpful suggestions you'll get. There are a number of very knowlegeable techs on this forum that are glad to help. I'm still learning, myself. Welcome to the forum.
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One of my experiences with this was the w/p was leaking onto the opti only when the engine was hot and cooling system was pressurized. Car would run fine until it got anywhere around operating temp and then would start to hesitate.
That too...
That too...
94 car, the only way is to scan it. Autozone will only be able to do 96 & up (OBD2). Got a mechanic friend with a good scanner? Buy him a 6 pack of his favorite. It literally takes under a minute to pull the codes. Here's a guide for OBD1 F-Body codes for 94-95:
http://www.shbox.com/1/Dtcs.htm
The guy who runs the site is a member here. Almost anything you could want to know is there. Spend a day sometime reading everything you can- twice.
http://www.shbox.com/1/Dtcs.htm
The guy who runs the site is a member here. Almost anything you could want to know is there. Spend a day sometime reading everything you can- twice.
you can take a paperclip and jump the top two slots on the top right.
turn the key on and the service light will flash 12 times to let you know your in the computer. then it will flash for codes just do a little research and you'll get it.
turn the key on and the service light will flash 12 times to let you know your in the computer. then it will flash for codes just do a little research and you'll get it.
Paperclip trick (code 12, followed by stored codes, then code 12) works on the 93s. 1994 & up you MUST use an OBD1 scanner.
Edit:
BTW, code 12 is signified by one long, two short flashes. Long for tens place, short for ones place. Code 12 lets you know the ECM is in a ready state. Last code 12 is to signify end of stores codes. in 1994 the socketed PROM ("Programmable Read Only Memory" or "Chip") was replaced by the PCM ("Powertrain Control Module"). No more removable chip, no more paperclip... still great for 3rd gen cars and lots of other older GM vehicles, though.
Edit:
BTW, code 12 is signified by one long, two short flashes. Long for tens place, short for ones place. Code 12 lets you know the ECM is in a ready state. Last code 12 is to signify end of stores codes. in 1994 the socketed PROM ("Programmable Read Only Memory" or "Chip") was replaced by the PCM ("Powertrain Control Module"). No more removable chip, no more paperclip... still great for 3rd gen cars and lots of other older GM vehicles, though.
Last edited by Gojira94; Jul 27, 2010 at 10:09 PM.
Thread Starter
Staging Lane
Joined: Oct 2008
Posts: 85
Likes: 0
From: Kyle,tx
It still stumbles and when I out on an obd1 scanner it was reading no codes stored in the computer and the ses light was still on but couldn't read any codes I'm getting real lost any more suggestions
